Millie Mackintosh and Professor Green keep their cool with ice cream as they step out for Jonathan Yeo Summer Party

Millie Mackintosh and Professor Green kept their cool by feasting on ice creams as they stepped out for artist Jonathan Yeo's Summer Party.

Mackintosh, 24, looked stunning in a plunging black summer dress as she arrived hand-in-hand with her husband Green.

The pair – who are fast approaching their second wedding anniversary – made a rare public appearance at Yeo's event.

Mackintosh joined her girl friends Laura Whitmore, Ella Eyre and Gemma Chan to attend the opening day of Wimbledon on Monday but left singer Green at home to finish writing his book, but he took time out to attend last night's party.

Speaking to Kirsty Young on Desert Island Discs, he said: "We sort of talk about it and I suddenly think, ‘Oh my goodness I’m such an age now’, but actually that’s rather good, but we better get on with it if we do.”

Andrew Lloyd Webber and his wife Madeleine Gurdon were also in attendance.